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Reverse light wiring location

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Old 08-24-11, 08:47 PM   #1
NVAKeith
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Default Reverse light wiring location

My trailer has surge brakes so I need to tap into the reverse light circuit to convert the 4 wire trailer harness to 5 wire. Just wondering if anyone knows if the reverse light wiring runs in the lower cargo area anywhere...trying to avoid having to trace it from the hatch into the headliner. Thanks!
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Old 08-27-11, 12:21 AM   #2
jellyroll
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If my memory serves me right, the reverse lights wire run under the cargo area floor where it meets the side wall on drivers side. The wire was red in my 2008. I know it's on the drivers side, I just don't remember if it runs on the floor or a couple of inches up the side. Either way you need to remove the floor
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Old 08-27-11, 05:34 PM   #3
kiwi
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if you remove the left most cubby hole / bin in the trunk area (not a quick process). you will see a female connector. that is the connector the dealer uses to install their trailer package. one of those wires will be a reverse wire.

i tapped into all of those wires when i added a 4 pin harness
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Old 11-19-11, 12:07 PM   #4
NVAKeith
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Thanks for the replies. I'm working on the project right now. I've got the rear cargo floor compartments out and the tailgate lower covers off.

In the tailgate the reverse light wires are pink with a gray hash mark. There are no wires under the cargo floor with the same color scheme. Does anyone know if the harness from the tailgate runs through the headliner to the front of the car vs. coming down the C-pillar?

I'd rather tap into the circuit in the front footwell kick pannel than try to run a wire from the inside the tailgate down into the cargo hold...

Thanks!
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Old 11-19-11, 05:00 PM   #5
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Quote:
Originally Posted by kiwi View Post
if you remove the left most cubby hole / bin in the trunk area (not a quick process). you will see a female connector. that is the connector the dealer uses to install their trailer package. one of those wires will be a reverse wire.

i tapped into all of those wires when i added a 4 pin harness
The 4 wires in the factory trailer harness are: ground, running lights, left turn/brake, right turn/brake.
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Old 11-19-11, 05:04 PM   #6
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Quote:
Originally Posted by jellyroll View Post
If my memory serves me right, the reverse lights wire run under the cargo area floor where it meets the side wall on drivers side. The wire was red in my 2008. I know it's on the drivers side, I just don't remember if it runs on the floor or a couple of inches up the side. Either way you need to remove the floor
Thank You!!

The reverse trigger wire was a reddish/magenta color, in the fat harness on the left side of the cargo area.

Now to figure out which wire in there feeds the 12v power outlet...
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Old 11-20-11, 06:02 AM   #7
draco
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Quote:
Originally Posted by NVAKeith View Post

Now to figure out which wire in there feeds the 12v power outlet...
Multimeter...best tool ever.
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Old 03-09-14, 11:54 AM   #8
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Default Which red wire

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Originally Posted by NVAKeith View Post
Thank You!!

The reverse trigger wire was a reddish/magenta color, in the fat harness on the left side of the cargo area.

Now to figure out which wire in there feeds the 12v power outlet...
In the fat harness, mine has multiple red/magenta wires. How do you know which one to use?

Thanks
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Old 03-09-14, 05:16 PM   #9
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If memory serves me right, it's this red one I took a picture of:



For reference, that's the fuel door manual release handle to the upper left. Of note, I am using this wire only to trigger a relay, not wiring it directly to the trailer harness. I do not know what reserve, if any, amperage is available on this red wire. I am running power to the relay from the rear 12v outlet.

While I was in there, I also added a pair of these:



Now we can see what's on the ground behind the car when backing up at night!
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Old 03-10-14, 09:15 AM   #10
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Thank you!! All hooked up!
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Old 03-11-14, 04:53 PM   #11
macprint
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Lightbulb

Quote:
Originally Posted by NVAKeith View Post
If memory serves me right, it's this red one I took a picture of:



For reference, that's the fuel door manual release handle to the upper left. Of note, I am using this wire only to trigger a relay, not wiring it directly to the trailer harness. I do not know what reserve, if any, amperage is available on this red wire. I am running power to the relay from the rear 12v outlet.

While I was in there, I also added a pair of these:



Now we can see what's on the ground behind the car when backing up at night!

WOW. Great idea. factory back-up lights are useless at night.
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Old 11-17-14, 07:44 PM   #12
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Thanks for this post. It saved me a lot of time finding the wire. For my 06 RX400h my wire was gray. Must be a hybrid thing.

I went for the OEM look. I fished the 5 new wires through the existing OEM loom and spliced the inside connector on the new wires. I then bolted the 5 wire plug to the horizontal plate that was welded to the hitch. The connector is slightly farther under the bumper now so it is hidden better.
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2004, 97, color, es300, gx470, lexus, light, location, lx470, rear, reverse, revese, rx, rx330, wire

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